H&R 38 S&W Defender

I recently acquired a revolver from an individual who was going to have it destroyed. The gun is missing the cylinder and the previous owner could not find a replacement. This is my first revolver and I know very little about them. The model is a defender 38 and I was wondering if anyone knows where I could get a cylinder for it? Also I noticed there are many different models by H&R. Will a cylinder on any other model fit this one?